The Lamborghini, which won the opening two rounds of the GT Daytona season with Grasser Racing Team, will be 30 kg heavier for Mid-Ohio, with the minimum weight increased from 1300 to 1330 kg.

It compares to the Audi, which has been given a 25 kg weight break, bringing the car down to 1355 kg, with the Mercedes now at 1380 kg, thanks to a 20kg reduction for the heaviest car in the class.

Fuel capacity adjustments have also been handed out to four cars, with the Lamborghini and Lexus RC F GT3 getting a 1-liter reduction and the Mercedes gaining 2 liters and Porsche 911 GT3 R getting 1 additional liter.

The McLaren, which makes its North American debut, meanwhile, has been baselined with a minimum weight of 1320 kg and a 8,000 RPM limit.

Its turbo boost ratio has also been established, following a test by Compass Racing at Mid-Ohio earlier this month that was overseen by IMSA’s technical department.

No changes have been announced for the DPi or GT Le Mans class cars ahead of the first two-hour and 40-minute race of the season on May 5.

John Dagys is the founder and Editor-in-Chief of Sportscar365 as well as the recently launched e-racing365 Web site for electric racing. Dagys spent eight years as a motorsports correspondent for FOXSports.com/SPEED Channel, and contributes to other publications worldwide. Contact John